Equity Buildup Calculator Formula

Understand the math behind the equity buildup calculator. Each variable explained with a worked example.

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Formulas Used

Projected Equity

future_equity = future_property_value - future_loan_balance

Current Equity

starting_equity = initial_equity

Equity from Appreciation

equity_from_appreciation = future_property_value - property_value

Equity from Loan Paydown

equity_from_paydown = total_paydown

Variables

VariableDescriptionDefault
property_valueCurrent Property Value(USD)400000
loan_balanceCurrent Loan Balance(USD)320000
monthly_principal_paydownMonthly Principal Paydown(USD)500
annual_appreciationAnnual Appreciation Rate(%)3
yearsTime Period(years)5
initial_equityDerived value= property_value - loan_balancecalculated
future_property_valueDerived value= property_value * pow(1 + annual_appreciation / 100, years)calculated
total_paydownDerived value= monthly_principal_paydown * years * 12calculated
future_loan_balanceDerived value= loan_balance - total_paydowncalculated

How It Works

How Equity Builds Over Time

Equity in real estate grows from two main sources: mortgage principal paydown and property appreciation.

Formula

Future Equity = Future Property Value - Future Loan Balance

  • Future Property Value = Current Value x (1 + Appreciation Rate)^Years
  • Future Loan Balance = Current Balance - Total Principal Payments

    • Sources of Equity

    1. Initial equity from your down payment 2. Paydown equity from each mortgage payment that reduces the principal 3. Appreciation equity from market value increases

    Worked Example

    A $400,000 property with a $320,000 loan balance, $500/month principal paydown, 3% appreciation, held for 5 years.

    property_value = 400000loan_balance = 320000monthly_principal_paydown = 500annual_appreciation = 3years = 5
    1. 01Current equity: $400,000 - $320,000 = $80,000
    2. 02Future property value: $400,000 x (1.03)^5 = $463,710
    3. 03Total principal paydown: $500 x 60 = $30,000
    4. 04Future loan balance: $320,000 - $30,000 = $290,000
    5. 05Projected equity: $463,710 - $290,000 = $173,710
    6. 06Equity from appreciation: $463,710 - $400,000 = $63,710

    Ready to run the numbers?

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